ODP Site 1092: revised composite depth section has implications for Upper Miocene `cryptochrons'

Details ODP Site 1092: revised composite depth section has implications for Upper Miocene `cryptochrons' ODP Site 1092: revised composite depth section has implications for Upper Miocene `cryptochrons'

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004geoji.156..195e&link_type=abstract

Geophysical Journal International, Volume 156, Issue 2, pp. 195-199.

Astronomy and Astrophysics

Astronomy

2

Cryptochrons, Magnetostratigraphy, Miocene, South Atlantic

Scientific paper

An Upper Miocene magnetic polarity stratigraphy has been developed for the C3r to C5ABn interval of ODP site 1092 from the sub-Antarctic South Atlantic (Evans & Channell 2003). New data from X-ray fluorescence (XRF) scanning of half cores has led to development of a revised composite depth section for the site. This has implications for the magnetostratigraphic interpretation. Using the shipboard-derived composite section, four subchrons were identified within the normal polarity zone correlative to C5n.2n. The revised composite section results in subchrons C5n.2n-2 and C5n.2n-3 of Evans & Channell (2003) becoming a single subchron recorded in two overlapping cores. The revised number of polarity subchrons within C5n.2n is now three, rather than four, which is consistent with the number of `cryptochrons' recognized in marine oceanic anomaly data.

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